With all that missing, I'd not trust the too rich codes and not sure I'd trust the too lean codes. And why is the engine idling at 1800 rpm? Or are you holding the throttle open?
The tach video really does not tell us much unless we know if you are holding the speed up like that, or is the ECU doing that to keep the engine running?

I have two questions:
Did you really do all that work and not change plugs and plug wires?
Have there been any indications of electrical gremlins? (Wing going up when it should not, slow cranking on starter engagement, odd indicator lights on the instrument panel, weird behaviour of the AM/FM head, etc.)